RB rankings from Yahoo

"25. San Diego Chargers: This is probably putting more faith in Ryan Mathews(notes) than any first-round pick deserves, but many scouts considered him the best prototype running back available in the draft this year. The Chargers definitely need that after letting LaDainian Tomlinson go this offseason. Darren Sproles(notes) is still a terrific third-down back, but that’s really all he is, a third-down guy. Sproles doesn’t have the strength to break tackles at the line and has to operate primarily in open space. Mathews is a between-the-tackles runner with great passion and toughness."